In a hospital in Greece, Michael Morbius, 10, welcomes his surrogate brother Lucien, whom he renames Milo; they bond over their common blood disease and their desire to be “normal”. Their adoptive father and hospital director, Nicholas, arranges for Michael to attend medical school in New York while he focuses on caring for Milo.
25 years later, Michael publicly denies the Nobel Prize for his work on synthetic blood. Michael’s colleague Martine Bancroft discovers he has captured dozens of vampire bats from Costa Rica in hopes of sharing their genes with their own to improve his condition. After telling Nicholas and Milo about his illegal experiment scheme, Michael receives funding to outfit a private mercenary ship in international waters with his equipment. While the healing is working, he turns Michael into a vampire. Michael kills and drains the crew of their blood after attacking them out of fear.
In a dangerous affliction with a rare blood disease and determined to save others from suffering the same fate, Dr. Morbius takes a desperate gamble. What seems at first a radical success soon turns out to be a potentially worse cure than the disease.